The Under Armour HeatGear Sonic Comp Short Sleeve Shirts are the advancement in Under Armour's performance workout apparel. The HeatGear Sonic features all the same moisture wicking and heat reducing capabilities as the previous design, and is now made with lighter, thinner material which increases mobility and further enhances the sweat eliminating properties. Compression design improves muscle strength and recovery while reducing fatigue to maintain power output and stamina.